ini_set("safe_mode",true);
?>
表 42-2. 安全模式限制函数
函数名 | 限制 |
---|---|
dbmopen() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
dbase_open() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
filepro() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
filepro_rowcount() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
filepro_retrieve() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
ifx_* | sql_safe_mode 限制, (!= safe mode) |
ingres_* | sql_safe_mode 限制, (!= safe mode) |
mysql_* | sql_safe_mode 限制, (!= safe mode) |
pg_loimport() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
posix_mkfifo() | 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
putenv() | 遵循 ini 设置的 safe_mode_protected_env_vars 和 safe_mode_allowed_env_vars 选项。请参考 putenv() 函数的有关文档。 |
move_uploaded_file() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
chdir() | 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
dl() | 本函数在安全模式下被禁用。 |
backtick operator | 本函数在安全模式下被禁用。 |
shell_exec()(在功能上和 backticks 函数相同) | 本函数在安全模式下被禁用。 |
exec() | 只能在 safe_mode_exec_dir 设置的目录下进行执行操作。基于某些原因,目前不能在可执行对象的路径中使用 ..。escapeshellcmd() 将被作用于此函数的参数上。 |
system() | 只能在 safe_mode_exec_dir 设置的目录下进行执行操作。基于某些原因,目前不能在可执行对象的路径中使用 ..。escapeshellcmd() 将被作用于此函数的参数上。 |
passthru() | 只能在 safe_mode_exec_dir 设置的目录下进行执行操作。基于某些原因,目前不能在可执行对象的路径中使用 ..。escapeshellcmd() 将被作用于此函数的参数上。 |
popen() | 只能在 safe_mode_exec_dir 设置的目录下进行执行操作。基于某些原因,目前不能在可执行对象的路径中使用 ..。escapeshellcmd() 将被作用于此函数的参数上。 |
fopen() | 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
mkdir() | 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
rmdir() | 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
rename() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
unlink() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
copy() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 (on source and target ) |
chgrp() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
chown() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 |
chmod() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 另外,不能设置 SUID、SGID 和 sticky bits |
touch() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 |
symlink() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 (注意:仅测试 target) |
link() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 (注意:仅测试 target) |
apache_request_headers() | 在安全模式下,以“authorization”(区分大小写)开头的标头将不会被返回。 |
header() | 在安全模式下,如果设置了 WWW-Authenticate,当前脚本的 uid 将被添加到该标头的 realm 部分。 |
PHP_AUTH 变量 | 在安全模式下,变量 PHP_AUTH_USER 、PHP_AUTH_PW 和 PHP_AUTH_TYPE 在 $_SERVER 中不可用。但无论如何,您仍然可以使用 REMOTE_USER 来获取用户名称(USER)。(注意:仅 PHP 4.3.0 以后有效) |
highlight_file(), show_source() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 (注意,仅在 4.2.1 版本后有效) |
parse_ini_file() | 检查被操作的文件或目录是否与正在执行的脚本有相同的 UID(所有者)。 检查被操作的目录是否与正在执行的脚本有相同的 UID(所有者)。 (注意,仅在 4.2.1 版本后有效) |
set_time_limit() | 在安全模式下不起作用。 |
max_execution_time | 在安全模式下不起作用。 |
mail() | 在安全模式下,第五个参数被屏蔽。(注意,仅自 PHP 4.2.3 起受影响) |
任何使用 php4/main/fopen_wrappers.c 的函数 | ?? |

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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